How to return a value from pthread threads in C?

by

Here is a correct solution. In this case tdata is allocated in the main thread, and there is a space for the thread to place its result.

#include <pthread.h>
#include <stdio.h>

typedef struct thread_data {
   int a;
   int b;
   int result;

} thread_data;

void *myThread(void *arg)
{
   thread_data *tdata=(thread_data *)arg;

   int a=tdata->a;
   int b=tdata->b;
   int result=a+b;

   tdata->result=result;
   pthread_exit(NULL);
}

int main()
{
   pthread_t tid;
   thread_data tdata;

   tdata.a=10;
   tdata.b=32;

   pthread_create(&tid, NULL, myThread, (void *)&tdata);
   pthread_join(tid, NULL);

   printf("%d + %d = %d\n", tdata.a, tdata.b, tdata.result);   

   return 0;
}

More Related Contents:

  1. Undefined reference to pthread_create in Linux
  2. Why do pthreads’ condition variable functions require a mutex?
  3. Why does pthread_cond_wait have spurious wakeups?
  4. sem_init on OS X
  5. When the main thread exits, do other threads also exit?
  6. Does guarding a variable with a pthread mutex guarantee it’s also not cached?
  7. Does pthread_cond_wait(&cond_t, &mutex); unlock and then lock the mutex?
  8. Kill Thread in Pthread Library
  9. How to set the name of a thread in Linux pthreads?
  10. Is it possible to determine the thread holding a mutex?
  11. pthread_create and passing an integer as the last argument
  12. Detached vs. Joinable POSIX threads
  13. Can I get Unix’s pthread.h to compile in Windows?
  14. How do I get a thread ID from an arbitrary pthread_t?
  15. Share condition variable & mutex between processes: does mutex have to locked before?
  16. Pass integer value through pthread_create
  17. When to use pthread_exit() and when to use pthread_join() in Linux?
  18. Check to see if a pthread mutex is locked or unlocked (After a thread has locked itself)
  19. Signal handling in pthreads
  20. Pthread Run a thread right after it’s creation
  21. How do you query a pthread to see if it is still running?
  22. When to use pthread condition variables?
  23. Does pthread_mutex_lock contains memory fence instruction? [duplicate]
  24. Implementing a FIFO mutex in pthreads
  25. Linux/POSIX equivalent for Win32’s CreateEvent, SetEvent, WaitForSingleObject
  26. Which thread handles the signal?
  27. Unexpected output in a multithreaded program
  28. PTHREAD_MUTEX_INITIALIZER vs pthread_mutex_init ( &mutex, param)
  29. Program received signal SIGPIPE, Broken pipe
  30. pthread execution on linux

Leave a Comment